Answer: 106
Step-by-step explanation: you have a total of 180 degrees in there, so you only gotta find the unknown value of the other side so you do 180 - 64 which is 116. then you see that in order to get 116 you gotta add it times ten which you are gonna subtract by 10 which is 106, and 106 will be your answer.
To find the value of x let's make the situation a bit easier
3x+10+70=180
3x+80=180
3x=180-80
3x=100
x = about 33.33
Answer: A. The expression
reveals the approximate rate of increase in the number of subscribers if measured six times a year.
Step-by-step explanation:
Here, The number of subscribers to an online magazine is increasing by 34% each year. The function represents the number of subscribers after t years.

where
represents rate of increase in the number of subscriber.
If rate is measured six times a year
then the number of subscriber, 
( approx)
Thus, when we measure increment in six times a year then the rate rate of increase in the number of subscribers=
Therefore Option A is correct.
Note: Option B) is incorrect because rate of increase in the number of subscribers if measured three times a year =
( approx)
Option C) is incorrect because rate of increase in the number of subscribers if measured four times a year =
( approx)
Option D) is incorrect because rate of increase in the number of subscribers if measured two times a year =
( approx)
189 is 45% of 420 and 198 is 55% of 360
189 = .45x
/.45 /.45
420 = x
198 = .55x
/.55 /.55
360 = x